Nova (complete) lock set part number?

Hi Guys, can anyone supply me with a (or their) chassis number which came with the version where the petrol cap has the plastic spring loaded flap to cover the key hole? as the one i ordered under my chassis number came without that one. hence was difficult getting a refund!!!!!!!! Help??? pls

Im only asking because vauxhall cant seem to get a discription on their system that tells you which petrol cap comes with what lock set part number!

As its a speacial order part its not so easy getting a refund, hence wanna order the right one this time, or if anyone know that exact part number?:)

P.S i bought one few years back with that lock set but dont know the chassis number! (cant find through reg)